Definition: You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.
Input: Question: If x and y are positive integers, and x^3*y^4 = 16, which of the following is the value of xy?

 Option A: 2

 Option B: 4

 Option C: 6

 Option D: 8

 Option E: 10

Option A